AACO Water Bill Help Center for Online Pay, Quarterly Bills and High Usage Fixes
This guide helps Anne Arundel County utility customers pay a water or wastewater bill, use Paymentus, enroll in AutoPay, avoid late fees, request a leak adjustment, apply for a pool credit, handle a turn-off notice, and understand July 2026 water and sewer rates.
Every step below includes the official county link, phone number, address or form path beside the action, so users can pay, call, email, mail, visit a cashier office, or file the right request without searching again.
Fast answer: Anne Arundel County water and wastewater customers can pay online through Paymentus, pay by phone at 1-833-277-8723, enroll in AutoPay, mail payment to A.A.Co. Water & Wastewater, P.O. Box 17003, Baltimore, MD 21297-1003, use county cashier offices or yellow drop boxes, or pay at participating Walmart locations for a listed convenience fee.
Late-payment warning: county utility bills are generally billed quarterly. If payment is not received by the net due date, a 10% late fee is added. If the account is scheduled for turn off, the county lists a $50 administrative fee, and meter readers or Emergency Services crews cannot accept payments or make extensions.
Anne Arundel County Water Bill Quick Facts
AACO Water Bill Action Board
Start here. Each card gives the user’s likely problem, the exact action, and the official county path.
I need to pay online now
Use the Paymentus portal linked by Anne Arundel County. Online payments can show as pending and may take up to two business days to appear on the account.
Open PaymentusI want to pay by phone
Call 1-833-277-8723. Have your utility account number or real estate tax parcel number and payment information ready.
Call phone paymentI need customer-service help
Call 410-222-1144 for billing issues, lost bills, high bills, payment plans, copy requests and turn-off questions.
Call Customer ServiceMy service was turned off
Contact Customer Service during business hours or Emergency Services after hours. Once scheduled for turn off, payment rules become stricter.
Turn-off stepsMy bill is unusually high
Ask Customer Service for meter reading verification and check whether leak adjustment, pool credit or excess-use credit applies.
Leak adjustmentI need AutoPay
Use Paymentus registration. For utility bills, enter the 15 digits of the account number shown on the bill, without dashes.
AutoPay instructionsAnne Arundel County Utility Bill Payment Options
| Payment path | How it works | Fee / warning | Official action |
|---|---|---|---|
| Online Paymentus | View bills, pay one or several bills, or schedule a future payment. | Utility bill credit/debit card fee listed as $3.25 per transaction; eCheck listed as $0.50. | Pay online |
| Pay by phone | Call 1-833-277-8723 with utility account number or real estate parcel number. | Convenience fees apply; allow up to 48 hours after payment date for reflection on account. | Call 1-833-277-8723 |
| AutoPay | Set recurring payment for fixed amount or full bill amount through Paymentus. | Use 15-digit utility account number without dashes; online convenience fees apply. | Enroll in AutoPay |
| Mail check or money order to A.A.Co. Water & Wastewater, P.O. Box 17003, Baltimore, MD 21297-1003. | Make payable to Anne Arundel County. Do not mail if near turn-off deadline. | Mail details | |
| Drop box | Yellow drop boxes are available at cashier locations. | Check/money order only. Do not place cash. Allow 1–2 days for processing. | Drop-box details |
| Walk-in cashier | Pay at county cashier offices. Cashiers accept cash, check or money order. | As of the county notice, cashier office hours changed to 8:00 a.m.–4:00 p.m.; confirm before visiting. | Cashier information |
| Walmart | Participating Walmart locations can accept utility/tax payments. | Walmart fee listed as $2.00 for utility bills. | Walmart note |
AutoPay Setup: 15-Digit Account Number Rule
Use 15 digits
For utility bills, enter the 15 digits of the account number as shown on your bill, without dashes.
Read AutoPay instructionsChoose payment style
AutoPay can be a fixed recurring payment or full bill amount on a scheduled day or due date.
Open portalPrint confirmation
Paymentus provides confirmation after schedule creation. Save email and screenshot until the first autopay posts.
Enrollment guideLate Fee, Turn-Off Notice and Restoring Water Service
10% late fee
If payment is not received by the net due date, Anne Arundel County adds a 10% late fee.
Late fee in rates$50 turn-off admin fee
If the account is scheduled for turn off, the county lists a $50 administrative fee.
Turn-off chargeRestoration contact
Call Customer Service at 410-222-1144 during business hours. After hours, weekends or holidays, call Emergency Services at 410-222-8400.
Call Emergency ServicesCall script for a late AACO water bill
10 AACO Water Bill Attributes Users Usually Need
1. Official pay portal
Anne Arundel County uses Paymentus for online utility payments and AutoPay.
Open Paymentus2. Customer service
Call 410-222-1144 for billing issues, lost bills, payment plans, high bills and service restoration guidance.
Call customer service3. Pay by phone
Call 1-833-277-8723 with your utility account number or real estate parcel number.
Call phone pay4. Billing cycle
Public water/wastewater services are billed quarterly by the Office of Finance.
Billing information6. Current rates
Effective July 1, 2026, water rate is $3.98 per 1,000 gallons and wastewater rate is $7.00 per 1,000 gallons.
Current rates7. Leak adjustment
Leak adjustments are a courtesy and may not be approved more than once every five years.
Leak adjustment8. Pool credit
Pool/hot tub fill credits may reduce sewer charges if the water did not enter the sanitary sewer system.
Pool credit9. Name/address change
A form is required to change the owner, tenant or mailing information on a utility billing account.
Change form10. Emergency services
For after-hours water/sewer emergency support, use 410-222-8400.
Call emergencyJuly 2026 Anne Arundel County Utility Rate Decoder
| Bill item | Official amount / rule | What it means for users | Official link |
|---|---|---|---|
| Water rate | $3.98 per 1,000 gallons. | Higher metered usage directly raises the water portion of the bill. | Utility rates |
| Wastewater rate | $7.00 per 1,000 gallons. | Wastewater is generally based on water delivered through the meter. | Wastewater rate |
| Account maintenance fee | Metered accounts: $6.00 per bill. Unmetered accounts: $3.00 per bill. | This covers meter reading and billing services. | Fee table |
| State Bay Restoration Fee | Residential property: $15.00 per bill. | This is a state-related charge and not a leak or usage line. | Bay fee |
| Infrastructure Maintenance Fee | 35% of all water and wastewater charges. | Large usage increases also raise this percentage-based charge. | Infrastructure fee |
| Utility Investment Fee | Starts with the second billing cycle in Fiscal Year 2027 and is based on meter size and service type. | Most quarterly customers see it on the October, November or December bill depending on billing cycle. | UIF details |
| Returned check fee | $25 for checks returned unpaid. | Also applies to banking return items or chargebacks in payment rules. | Payment fees |
| Meter reread request | $35 per request; waived if the reading is incorrect. | Use this when a bill seems wrong after checking usage and leaks. | Reread fee |
High AACO Water Bill, Estimated Bill or Meter Reread
Ask for meter verification
If the bill seems out of line, call 410-222-1144 and ask whether a work order can be processed for meter reading verification.
Call Customer ServiceEstimated bill clue
An estimated bill is marked with an “E” after the meter reading date. The next actual reading should adjust for the estimate.
Estimated bill explanationCheck common leaks
Toilets, hose bibs, irrigation, water softeners, crawlspace lines and outdoor spigots can raise a quarterly bill quickly.
Leak adjustment pageInside checks
- Toilet flapper or fill valve running.
- Water heater relief valve or pipe leak.
- Softener or filtration system stuck cycling.
- Basement, crawlspace or slab leak signs.
Outside checks
- Hose left running.
- Underground irrigation leak.
- Pool or hot tub fill.
- Wet ground near meter pit or service line.
Bill checks
- Was the bill estimated?
- Did usage jump above prior quarters?
- Did a 10% late fee post?
- Did UIF or infrastructure fee change?
High-bill call script
Leak Adjustment Request: What It Can and Cannot Do
Courtesy benefit
The county says leak adjustment is a courtesy benefit for customers facing costly plumbing repairs and a high utility bill.
Leak adjustment requestOnce every five years
The county notes that a leak adjustment may not be approved more than once every five years.
Leak policyReduction, not erasure
A leak adjustment can reduce excess water consumption charges but will not eliminate the full bill.
Read limitsRepair first
Fix the leak and keep plumber invoice, photos, receipts, date repaired and service address.
Open request pageSubmit form
Email the completed form to custserv@aacounty.org or mail it to Anne Arundel County Customer Service, P.O. Box 427, Annapolis, MD 21404.
Email Customer ServicePool Credit and Excess Use Credit
Pool / hot tub credit
Customers may be considered for reduced sewer charges on water used to fill a swimming pool or hot tub.
Pool credit pageWater must not enter sewer
Applicants must certify the water did not enter the sanitary sewer system.
Pool verification formExcess use credit
The county applies a residential wastewater credit when the first full billing quarter after April 30 exceeds 110% of the average for the previous three quarters.
Excess use explanationName/Address Change, Tenant Change and Property Transfer
| Situation | Official rule | Practical step | Official action |
|---|---|---|---|
| New owner | A form must be submitted to change owner information on a utility billing account. | The new owner or title company should submit the new-owner change request. | Name/address forms |
| Tenant change | Tenant change must be submitted by the property owner. | Landlords should not wait for the tenant to fix county billing records. | Tenant change |
| Final bill | Final bills for property transfers and tenancy changes are listed at $35.00. | Ask for final bill status before closing or returning a tenant deposit. | Final bill fee |
| Lien certificate | Property lien certificate application includes a listed $50 payment or AA County account number. | Use for closing, title or lien-status verification. | Lien certificate |
Payment Assistance and Payment Plan Contacts
Call Customer Service first
If you cannot afford the full bill by the due date, call 410-222-1144 and ask about payment plans and account options.
Call 410-222-1144Bill assistance page
Anne Arundel County lists assistance resources including water bill assistance and county/community support options.
Assistance resourcesEmail support
You can also email custserv@aacounty.org for billing questions, but call if shutoff risk is close.
Email Customer ServiceWater/Sewer Emergency and Public Works Contacts
24-hour emergency
For after-hours, weekend or holiday water/sewer emergency issues, call 410-222-8400.
Call emergencyBureau of Utility Operations
For utility operations information, the Bureau of Utility Operations lists 410-222-7500.
Utility OperationsReport a concern
County infrastructure concerns can be reported through 311 or the county’s online reporting path.
Report concernAnne Arundel County Cashier Map and Visit Plan
Use this map for the Arundel Center cashier location in Annapolis. The county also lists a Riva Road office and a Glen Burnie location, but Glen Burnie was posted as temporarily closed for construction; verify before visiting.
Bring
Bill, account number, photo ID, payment method, confirmation number, shutoff notice, leak repair proof or pool verification documents.
Ask before leaving
“Is the payment posted, is any late fee or turn-off fee still due, and is my account clear from turn-off status?”
Drop-box rule
Use check or money order only. Do not place cash in yellow drop boxes. Allow 1–2 days for processing.
Official Anne Arundel County Utility Links
AACO Water Bill FAQ
How do I pay my Anne Arundel County water bill online?
Use the official Paymentus portal linked by Anne Arundel County. You can pay online, schedule a payment, pay multiple bills, or register for AutoPay.
What is the Anne Arundel County water bill customer service number?
Call 410-222-1144 for utility billing issues, lost bills, payment plans, high bills, account copies and turn-off questions.
What is the AACO pay-by-phone number?
Call 1-833-277-8723. Have your utility account number or real estate tax parcel number and payment information ready.
How often are AACO water and wastewater bills sent?
Anne Arundel County says public water and wastewater services are billed quarterly by the Office of Finance.
What is the late fee for Anne Arundel County utility bills?
If payment is not received by the net due date, a 10% late fee is added to the utility bill.
What if my water service has been turned off?
Call Customer Service at 410-222-1144 during business hours. After business hours, weekends or holidays, call Emergency Services at 410-222-8400. Meter Services and Emergency Services crews cannot accept payments or make extensions.
What are the 2026 Anne Arundel County water and wastewater rates?
Effective July 1, 2026, the county lists the water rate as $3.98 per 1,000 gallons and the wastewater rate as $7.00 per 1,000 gallons.
Can I get a leak adjustment?
Possibly. Anne Arundel County says leak adjustment is a courtesy benefit for owner-side plumbing leaks, may not be approved more than once every five years, and reduces but does not eliminate excess water charges.
Can I get a sewer credit for filling a pool?
Possibly. Customers can be considered for a reduction of sewer charges for water used to fill a swimming pool or hot tub, but they must certify that the water did not enter the sanitary sewer system.
Where can I pay an Anne Arundel County utility bill in person?
The county lists cashier locations including the Arundel Center at 44 Calvert Street in Annapolis and the Heritage Complex at 2664 Riva Road. Check current cashier notices first because Glen Burnie was posted as temporarily closed for construction.